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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Dec. 13, 2017	Aug. 18, 2017	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Treasury stock acquired, shares			1,101,969	574,054
Average cost per share (in usd per share)			$ 16.03	$ 24.35
Payments for repurchase of equity			$ 17.7	$ 14.0
Board of Directors Chairman [Member] | Share Repurchase [Member]
Related Party Transaction [Line Items]
Treasury stock acquired, shares		100,000
Average cost per share (in usd per share)		$ 23.85
Payments for repurchase of equity		$ 2.4
Purchases from related party	$ 0.3

X

- Definition

The cash outflow to reacquire common and preferred stock.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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Number of shares that have been repurchased during the period and are being held in treasury.

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